KSC

KSC is a much more restrained version of LOL. Most often, someone who sends you this acronym is having a small laugh at something mildly funny. Thus, their laughter equates to only a minor, half-hearted chuckle.

Alternatively, people sometimes use KSC when they have mixed feelings about something, but still can't help but laugh. For example, if you send a friend a joke that they think is in poor taste but still a bit funny, they might respond with KSC.